South Africa has celebrated the 89th birthday of Archbishop Desmond Tutu, with the president calling the prominent anti-apartheid activist "a national treasure".
Nobel laureate Tutu was instrumental in the fight against the racist apartheid regime and continues to condemn corruption in democratic South Africa.
Like his friend, the late president Nelson Mandela, he is know for his mischievous sense of humour.
"Archbishop Tutu is a national treasure and global icon of moral consistency, spiritual virtue and the defence of the most vulnerable people not only in South Africa but around the world. I wish the Arch a very happy birthday," President Cyril Ramaphosa wrote on Twitter.
To mark "the Arch's" birthday, his foundation is staging the 10th Annual Desmond Tutu International Peace Lecture online.
This year it focuses on climate change, with Christiana Figueres, former executive secretary of the United Nations Framework Convention on Climate Change, hosting the event.
Swedish teenage activist Greta Thunberg was initially due to host it but pulled out for reasons not specified.